Journal ArticleDOI
Optical properties of calcite and gypsum in crystalline and powdered form in the infrared and far-infrared
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TLDR
In this article, the complex indices of refraction for crystalline gypsum and calcite were determined from reflectance measurements for both single crystals and pressed powder pellets using a classical dispersive analysis (DA) of the reflectance data.About:
This article is published in Infrared Physics.The article was published on 1993-04-01. It has received 78 citations till now. The article focuses on the topics: Far infrared & Crystal.read more
Citations
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Incorporation of mineralogical composition into models of the radiative properties of mineral aerosol from UV to IR wavelengths
Irina N. Sokolik,Owen B. Toon +1 more
TL;DR: In this paper, a technique to model the radiative properties of mineral aerosols which accounts for their composition is described. But the authors focus on the spectral properties of the aerosols and do not consider the physical properties of these aerosols.
Journal ArticleDOI
Modeling the mineralogy of atmospheric dust sources
TL;DR: In this article, the authors proposed a new formulation to estimate the mineral content of arid surfaces on a global scale by collecting a Database of Arid Soil Surface Mineralogy for eight major minerals: quartz, feldspar, calcite, gypsum, illite, kaolinite, smectite, and hematite.
Journal ArticleDOI
Reevaluation of Mineral aerosol radiative forcings suggests a better agreement with satellite and AERONET data
TL;DR: In this paper, the authors used the shortwave refractive index of dust to constrain these refractive indices using a mineralogical database and varying the abundances of iron oxides (the main absorber in the visible).
Journal ArticleDOI
Modeling the radiative characteristics of airborne mineral aerosols at infrared wavelengths
TL;DR: In this paper, the authors explore the importance of the composition of airborne mineral aerosols for assessment of their direct radiative forcing at infrared wavelengths and show that the existing variations in refractive places can cause large changes in the major aerosol optical characteristics.
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Absorption and reflection infrared spectra of MgO and other diatomic compounds
TL;DR: In this paper, the authors presented reflection and absorption spectra of single-crystal MgO from about ∼100 to 18 000 cm −1 (∼100 to 0.5 µm), and derived emissivity, dielectric and optical functions (n and k) using classical dispersion analysis and supplementary data to ensure that the reflectivity values are correct at the low and high frequency limits.
References
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The optical constants of several atmospheric aerosol species: Ammonium sulfate, aluminum oxide, and sodium chloride
TL;DR: In this paper, the authors investigated the use of measured optical constants in the simulation of real atmospheric aerosols, taking into account transmission measurements through homogeneous and inhomogeneous materials, the immersion of a material in a liquid of a known refractive index, the minimum deviation angle of prism measurement, the interference of multiply reflected light, reflectivity measurements, and aspects of mathematical analysis.
Journal ArticleDOI
Measurement of the Absorption Coefficient of Atmospheric Dust
James D. Lindberg,Larry S. Laude +1 more
TL;DR: A method developed by previous workers for measuring the absorption coefficient of strongly absorbing powdered materials has been applied to samples of atmospheric dust in the 0.3-1.1-microm wavelength interval, and the corresponding imaginary refractive index is calculated.
Journal Article
Diffuse reflectance spectra of several clay minerals
TL;DR: In this paper, it was shown that the major features of the near infrared absorption spectra of montmorillonite and kaolin clays are determined primarily by the water present in the clay stmctures.
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Studies of the middle‐ and far‐infrared spectra of mineral surfaces for application in remote compositional mapping of the Moon and planets
TL;DR: Middle and far IR spectra of silicate minerals for remote sensing of lunar or planetary surface composition were used in this paper, where the authors proposed a method to obtain the spectral properties of the silicate mineral spectra.
Journal ArticleDOI
Optical constants of monoclinic anisotropic crystals: gypsum
TL;DR: The usefulness of such optical constants for modeling the infrared properties of powders is demonstrated and the oscillator parameters are presented here, together with formulas for calculating the optical constants at any desired infrared frequency.
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Incorporation of mineralogical composition into models of the radiative properties of mineral aerosol from UV to IR wavelengths
Irina N. Sokolik,Owen B. Toon +1 more